[tex]\displaystyle\bf\\1)\\\\\alpha =3 \ \ \ ; \ \ \ R=5\\\\\\L=\frac{\pi R}{180} \cdot \alpha =\frac{\pi \cdot 5}{180} \cdot 3=\frac{\pi }{12} \\\\2)\\\\\alpha =\frac{3\pi }{4} \ \ \ ; \ \ \ R=6\\\\\\L=\frac{\pi R}{180} \cdot \alpha =\frac{\pi \cdot 6}{180} \cdot \frac{3\pi }{4} =\frac{\pi ^{2} }{40} \\\\3)\\\\\alpha =0,4\pi \ \ \ ; \ \ \ R=2\\\\\\L=\frac{\pi R}{180} \cdot \alpha =\frac{\pi \cdot 2}{180} \cdot 0,4\pi =\frac{\pi ^{2} }{450}[/tex]
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[tex]\displaystyle\bf\\1)\\\\\alpha =3 \ \ \ ; \ \ \ R=5\\\\\\L=\frac{\pi R}{180} \cdot \alpha =\frac{\pi \cdot 5}{180} \cdot 3=\frac{\pi }{12} \\\\2)\\\\\alpha =\frac{3\pi }{4} \ \ \ ; \ \ \ R=6\\\\\\L=\frac{\pi R}{180} \cdot \alpha =\frac{\pi \cdot 6}{180} \cdot \frac{3\pi }{4} =\frac{\pi ^{2} }{40} \\\\3)\\\\\alpha =0,4\pi \ \ \ ; \ \ \ R=2\\\\\\L=\frac{\pi R}{180} \cdot \alpha =\frac{\pi \cdot 2}{180} \cdot 0,4\pi =\frac{\pi ^{2} }{450}[/tex]